Results 1 to 10 of about 2,843 (153)

Internal and External Alignment of Carbonaceous Grains within the Radiative Torque Paradigm

Astrophysical Journal, 2023
We study the internal and external alignment of carbonaceous grains in the interstellar medium (ISM) within the Radiative Torque (RAT) paradigm.
Thiem Hoang, Vo Hong Minh Phan, Le Ngoc Tram   +2 more
exaly   +6 more sources

Laboratory Experiments on the Low-temperature Formation of Carbonaceous Grains in the ISM [PDF]

Astrophysical Journal, Supplement Series, 2017
Abstract The life cycle of cosmic dust grains is far from being understood and the origin and evolution of interstellar medium (ISM) grains is still under debate. In the ISM, the cosmic dust destruction rate is faster than the production rate by stellar sources.
Àkos Kereszturi, , Thomas Henning
exaly   +3 more sources

Evolution of grain size distribution with enhanced abundance of small carbonaceous grains in galactic environments

Monthly Notices of the Royal Astronomical Society, 2022
ABSTRACT We propose an updated dust evolution model that focuses on the grain size distribution in a galaxy. We treat the galaxy as a one-zone object and include five main processes (stellar dust production, dust destruction in supernova shocks, grain growth by accretion and coagulation, and grain disruption by shattering). In this paper,
Hiroyuki Hirashita, Hirashita Hiroyuki
exaly   +3 more sources

THE 6 μm FEATURE AS A TRACER OF ALIPHATIC COMPONENTS OF INTERSTELLAR CARBONACEOUS GRAINS [PDF]

Astrophysical Journal, 2016
ABSTRACT An unidentified infrared emission (UIE) feature at 6.0 μm is detected in a number of astronomical sources showing the UIE bands. In contrast to the previous suggestion that this band is due to C=O vibrational modes, we suggest that the 6.0 μm feature arises from olefinic double-bond functional groups.
Sun Kwok, Seyedabdolreza Sadjadi
exaly   +7 more sources

Low-temperature Formation of Carbonaceous Dust Grains from PAHs

Astrophysical Journal, 2020
Abstract Carbon is ubiquitous in space and plays a key role in prebiotic chemistry. Astronomical observations have found interstellar carbon in the form of polycyclic aromatic hydrocarbons (PAHs) as well as carbonaceous dust, confirming its presence in both gaseous and solid phases. The goal of this study is to experimentally investigate
Mattanjah De Vries, Lisseth Gavilan, Salma Bejaoui   +2 more
exaly   +2 more sources

Variations of organic functional chemistry in carbonaceous matter from the asteroid 162173 Ryugu [PDF]

Nature Communications
Primordial carbon delivered to the early earth by asteroids and meteorites provided a diverse source of extraterrestrial organics from pre-existing simple organic compounds, complex solar-irradiated macromolecules, and macromolecules from extended ...
Bradley De Gregorio, George D. Cody, Rhonda M. Stroud, A. L. David Kilcoyne, Scott Sandford, Corentin Le Guillou, Larry R. Nittler, Jens Barosch, Hikaru Yabuta, Zita Martins, Yoko Kebukawa, Taiga Okumura, Minako Hashiguchi, Shohei Yamashita, Yasuo Takeichi, Yoshio Takahashi, Daisuke Wakabayashi, Cécile Engrand, Laure Bejach, Lydie Bonal, Eric Quirico, Laurent Remusat, Jean Duprat, Maximilien Verdier-Paoletti, Smail Mostefaoui, Mutsumi Komatsu, Jérémie Mathurin, Alexandre Dazzi, Ariane Deniset-Besseau, Emmanuel Dartois, Yusuke Tamenori, Hiroki Suga, Gilles Montagnac, Kanami Kamide, Miho Shigenaka, Megumi Matsumoto, Yuma Enokido, Makoto Yoshikawa, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Satoru Nakazawa, Tomohiro Usui, Masanao Abe, Tatsuaki Okada, Toru Yada, Masahiro Nishimura, Aiko Nakato, Akiko Miyazaki, Kasumi Yogata, Hisayoshi Yurimoto, Tomoki Nakamura, Takaaki Noguchi, Ryuji Okazaki, Hiroshi Naraoka, Kanako Sakamoto, Shogo Tachibana, Sei-ichiro Watanabe, Yuichi Tsuda   +58 more
doaj   +2 more sources

Ab-initio dynamic study of mechanisms for dust-mediated molecular hydrogen formation in space [PDF]

Communications Chemistry
The reason for the abundance of molecular hydrogen (H2) in space remains unresolved. Here we study collision dynamics under spacelike conditions to test H2 formation mechanisms where carbonaceous dust grains may have a catalytic role.
Yuzhen Guo, David R. McKenzie
doaj   +2 more sources

Characterization of Presolar Silicate and Oxide Grains in Primitive Carbonaceous Chondrites

Astrophysical Journal, 2007
Raster ion imaging of the oxygen isotopes with the NanoSIMS ion microprobe has been used to identify presolar grains in two primitive meteorites. Eleven presolar silicates and eight presolar oxides were identified in the primitive carbonaceous chondrite Acfer 094 for abundances of 325 and 360 parts per million (ppm), respectively.
R M Stroud, Larry Nittler
exaly   +2 more sources

Carbonaceous dust grains in luminous infrared galaxies [PDF]

Astronomy and Astrophysics, 2007
[Conclusions] These observations further demonstrate the ubiquitousness of a-C:H in the diffuse interstellar medium (DISM) of galaxies, for a long time almost only observed in the Milky-Way ISM lines-of-sights. Whereas PAH emission lines trace the re-processing of energetic young stellar radiation, the observed a-C:H features underline the existence of
Emmanuel Dartois
exaly   +3 more sources

Structure and evolution of interstellar carbonaceous dust. Insights from the laboratory

Frontiers in Astronomy and Space Sciences, 2022
A large fraction of interstellar carbon is locked up in solid grains. The nature, origin and evolution of these grains have been investigated for decades.
Víctor J. Herrero, Miguel Jiménez-Redondo, Miguel Jiménez-Redondo, Ramón J. Peláez, Belén Maté, Isabel Tanarro   +5 more
doaj   +1 more source